drivers/ide/ide.c

   1 /*
   2  *  linux/drivers/ide/ide.c             Version 7.00beta2       Mar 05 2003
   3  *
   4  *  Copyright (C) 1994-1998  Linus Torvalds & authors (see below)
   5  */
   6
   7 /*
   8  *  Mostly written by Mark Lord  <mlord@pobox.com>
   9  *                and Gadi Oxman <gadio@netvision.net.il>
  10  *                and Andre Hedrick <andre@linux-ide.org>
  11  *
  12  *  See linux/MAINTAINERS for address of current maintainer.
  13  *
  14  * This is the multiple IDE interface driver, as evolved from hd.c.
  15  * It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs
  16  *   (usually 14 & 15).
  17  * There can be up to two drives per interface, as per the ATA-2 spec.
  18  *
  19  * Primary:    ide0, port 0x1f0; major=3;  hda is minor=0; hdb is minor=64
  20  * Secondary:  ide1, port 0x170; major=22; hdc is minor=0; hdd is minor=64
  21  * Tertiary:   ide2, port 0x???; major=33; hde is minor=0; hdf is minor=64
  22  * Quaternary: ide3, port 0x???; major=34; hdg is minor=0; hdh is minor=64
  23  * ...
  24  *
  25  *  From hd.c:
  26  *  |
  27  *  | It traverses the request-list, using interrupts to jump between functions.
  28  *  | As nearly all functions can be called within interrupts, we may not sleep.
  29  *  | Special care is recommended.  Have Fun!
  30  *  |
  31  *  | modified by Drew Eckhardt to check nr of hd's from the CMOS.
  32  *  |
  33  *  | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
  34  *  | in the early extended-partition checks and added DM partitions.
  35  *  |
  36  *  | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
  37  *  |
  38  *  | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
  39  *  | and general streamlining by Mark Lord (mlord@pobox.com).
  40  *
  41  *  October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
  42  *
  43  *      Mark Lord       (mlord@pobox.com)               (IDE Perf.Pkg)
  44  *      Delman Lee      (delman@ieee.org)               ("Mr. atdisk2")
  45  *      Scott Snyder    (snyder@fnald0.fnal.gov)        (ATAPI IDE cd-rom)
  46  *
  47  *  This was a rewrite of just about everything from hd.c, though some original
  48  *  code is still sprinkled about.  Think of it as a major evolution, with
  49  *  inspiration from lots of linux users, esp.  hamish@zot.apana.org.au
  50  *
  51  *  Version 1.0 ALPHA   initial code, primary i/f working okay
  52  *  Version 1.3 BETA    dual i/f on shared irq tested & working!
  53  *  Version 1.4 BETA    added auto probing for irq(s)
  54  *  Version 1.5 BETA    added ALPHA (untested) support for IDE cd-roms,
  55  *  ...
  56  * Version 5.50         allow values as small as 20 for idebus=
  57  * Version 5.51         force non io_32bit in drive_cmd_intr()
  58  *                      change delay_10ms() to delay_50ms() to fix problems
  59  * Version 5.52         fix incorrect invalidation of removable devices
  60  *                      add "hdx=slow" command line option
  61  * Version 5.60         start to modularize the driver; the disk and ATAPI
  62  *                       drivers can be compiled as loadable modules.
  63  *                      move IDE probe code to ide-probe.c
  64  *                      move IDE disk code to ide-disk.c
  65  *                      add support for generic IDE device subdrivers
  66  *                      add m68k code from Geert Uytterhoeven
  67  *                      probe all interfaces by default
  68  *                      add ioctl to (re)probe an interface
  69  * Version 6.00         use per device request queues
  70  *                      attempt to optimize shared hwgroup performance
  71  *                      add ioctl to manually adjust bandwidth algorithms
  72  *                      add kerneld support for the probe module
  73  *                      fix bug in ide_error()
  74  *                      fix bug in the first ide_get_lock() call for Atari
  75  *                      don't flush leftover data for ATAPI devices
  76  * Version 6.01         clear hwgroup->active while the hwgroup sleeps
  77  *                      support HDIO_GETGEO for floppies
  78  * Version 6.02         fix ide_ack_intr() call
  79  *                      check partition table on floppies
  80  * Version 6.03         handle bad status bit sequencing in ide_wait_stat()
  81  * Version 6.10         deleted old entries from this list of updates
  82  *                      replaced triton.c with ide-dma.c generic PCI DMA
  83  *                      added support for BIOS-enabled UltraDMA
  84  *                      rename all "promise" things to "pdc4030"
  85  *                      fix EZ-DRIVE handling on small disks
  86  * Version 6.11         fix probe error in ide_scan_devices()
  87  *                      fix ancient "jiffies" polling bugs
  88  *                      mask all hwgroup interrupts on each irq entry
  89  * Version 6.12         integrate ioctl and proc interfaces
  90  *                      fix parsing of "idex=" command line parameter
  91  * Version 6.13         add support for ide4/ide5 courtesy rjones@orchestream.com
  92  * Version 6.14         fixed IRQ sharing among PCI devices
  93  * Version 6.15         added SMP awareness to IDE drivers
  94  * Version 6.16         fixed various bugs; even more SMP friendly
  95  * Version 6.17         fix for newest EZ-Drive problem
  96  * Version 6.18         default unpartitioned-disk translation now "BIOS LBA"
  97  * Version 6.19         Re-design for a UNIFORM driver for all platforms,
  98  *                        model based on suggestions from Russell King and
  99  *                        Geert Uytterhoeven
 100  *                      Promise DC4030VL now supported.
 101  *                      add support for ide6/ide7
 102  *                      delay_50ms() changed to ide_delay_50ms() and exported.
 103  * Version 6.20         Added/Fixed Generic ATA-66 support and hwif detection.
 104  *                      Added hdx=flash to allow for second flash disk
 105  *                        detection w/o the hang loop.
 106  *                      Added support for ide8/ide9
 107  *                      Added idex=ata66 for the quirky chipsets that are
 108  *                        ATA-66 compliant, but have yet to determine a method
 109  *                        of verification of the 80c cable presence.
 110  *                        Specifically Promise's PDC20262 chipset.
 111  * Version 6.21         Fixing/Fixed SMP spinlock issue with insight from an old
 112  *                        hat that clarified original low level driver design.
 113  * Version 6.30         Added SMP support; fixed multmode issues.  -ml
 114  * Version 6.31         Debug Share INTR's and request queue streaming
 115  *                      Native ATA-100 support
 116  *                      Prep for Cascades Project
 117  * Version 7.00alpha    First named revision of ide rearrange
 118  *
 119  *  Some additional driver compile-time options are in ./include/linux/ide.h
 120  *
 121  *  To do, in likely order of completion:
 122  *      - modify kernel to obtain BIOS geometry for drives on 2nd/3rd/4th i/f
 123  *
 124  */
 125
 126 #define REVISION        "Revision: 7.00alpha2"
 127 #define VERSION         "Id: ide.c 7.00a2 20020906"
 128
 129 #define _IDE_C                  /* Tell ide.h it's really us */
 130
 131 #include <linux/module.h>
 132 #include <linux/types.h>
 133 #include <linux/string.h>
 134 #include <linux/kernel.h>
 135 #include <linux/timer.h>
 136 #include <linux/mm.h>
 137 #include <linux/interrupt.h>
 138 #include <linux/major.h>
 139 #include <linux/errno.h>
 140 #include <linux/genhd.h>
 141 #include <linux/blkpg.h>
 142 #include <linux/slab.h>
 143 #include <linux/init.h>
 144 #include <linux/pci.h>
 145 #include <linux/delay.h>
 146 #include <linux/ide.h>
 147 #include <linux/completion.h>
 148 #include <linux/reboot.h>
 149 #include <linux/cdrom.h>
 150 #include <linux/seq_file.h>
 151 #include <linux/device.h>
 152 #include <linux/bitops.h>
 153
 154 #include <asm/byteorder.h>
 155 #include <asm/irq.h>
 156 #include <asm/uaccess.h>
 157 #include <asm/io.h>
 158
 159
 160 /* default maximum number of failures */
 161 #define IDE_DEFAULT_MAX_FAILURES        1
 162
 163 static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
 164                                         IDE2_MAJOR, IDE3_MAJOR,
 165                                         IDE4_MAJOR, IDE5_MAJOR,
 166                                         IDE6_MAJOR, IDE7_MAJOR,
 167                                         IDE8_MAJOR, IDE9_MAJOR };
 168
 169 static int idebus_parameter;    /* holds the "idebus=" parameter */
 170 static int system_bus_speed;    /* holds what we think is VESA/PCI bus speed */
 171 static int initializing;        /* set while initializing built-in drivers */
 172
 173 DECLARE_MUTEX(ide_cfg_sem);
 174  __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
 175
 176 #ifdef CONFIG_BLK_DEV_IDEPCI
 177 static int ide_scan_direction; /* THIS was formerly 2.2.x pci=reverse */
 178 #endif
 179
 180 #ifdef CONFIG_IDEDMA_AUTO
 181 int noautodma = 0;
 182 #else
 183 int noautodma = 1;
 184 #endif
 185
 186 EXPORT_SYMBOL(noautodma);
 187
 188 #ifdef CONFIG_BLK_DEV_IDEACPI
 189 int ide_noacpi = 0;
 190 int ide_noacpitfs = 1;
 191 int ide_noacpionboot = 1;
 192 #endif
 193
 194 /*
 195  * This is declared extern in ide.h, for access by other IDE modules:
 196  */
 197 ide_hwif_t ide_hwifs[MAX_HWIFS];        /* master data repository */
 198
 199 EXPORT_SYMBOL(ide_hwifs);
 200
 201 /*
 202  * Do not even *think* about calling this!
 203  */
 204 static void init_hwif_data(ide_hwif_t *hwif, unsigned int index)
 205 {
 206         unsigned int unit;
 207
 208         /* bulk initialize hwif & drive info with zeros */
 209         memset(hwif, 0, sizeof(ide_hwif_t));
 210
 211         /* fill in any non-zero initial values */
 212         hwif->index     = index;
 213         hwif->major     = ide_hwif_to_major[index];
 214
 215         hwif->name[0]   = 'i';
 216         hwif->name[1]   = 'd';
 217         hwif->name[2]   = 'e';
 218         hwif->name[3]   = '0' + index;
 219
 220         hwif->bus_state = BUSSTATE_ON;
 221
 222         hwif->atapi_dma = 0;            /* disable all atapi dma */
 223         hwif->ultra_mask = 0x80;        /* disable all ultra */
 224         hwif->mwdma_mask = 0x80;        /* disable all mwdma */
 225         hwif->swdma_mask = 0x80;        /* disable all swdma */
 226
 227         init_completion(&hwif->gendev_rel_comp);
 228
 229         default_hwif_iops(hwif);
 230         default_hwif_transport(hwif);
 231         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 232                 ide_drive_t *drive = &hwif->drives[unit];
 233
 234                 drive->media                    = ide_disk;
 235                 drive->select.all               = (unit<<4)|0xa0;
 236                 drive->hwif                     = hwif;
 237                 drive->ctl                      = 0x08;
 238                 drive->ready_stat               = READY_STAT;
 239                 drive->bad_wstat                = BAD_W_STAT;
 240                 drive->special.b.recalibrate    = 1;
 241                 drive->special.b.set_geometry   = 1;
 242                 drive->name[0]                  = 'h';
 243                 drive->name[1]                  = 'd';
 244                 drive->name[2]                  = 'a' + (index * MAX_DRIVES) + unit;
 245                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
 246                 drive->using_dma                = 0;
 247                 drive->vdma                     = 0;
 248                 INIT_LIST_HEAD(&drive->list);
 249                 init_completion(&drive->gendev_rel_comp);
 250         }
 251 }
 252
 253 static void init_hwif_default(ide_hwif_t *hwif, unsigned int index)
 254 {
 255         hw_regs_t hw;
 256
 257         memset(&hw, 0, sizeof(hw_regs_t));
 258
 259         ide_init_hwif_ports(&hw, ide_default_io_base(index), 0, &hwif->irq);
 260
 261         memcpy(&hwif->hw, &hw, sizeof(hw));
 262         memcpy(hwif->io_ports, hw.io_ports, sizeof(hw.io_ports));
 263
 264         hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
 265 #ifdef CONFIG_BLK_DEV_HD
 266         if (hwif->io_ports[IDE_DATA_OFFSET] == HD_DATA)
 267                 hwif->noprobe = 1;      /* may be overridden by ide_setup() */
 268 #endif
 269 }
 270
 271 extern void ide_arm_init(void);
 272
 273 /*
 274  * init_ide_data() sets reasonable default values into all fields
 275  * of all instances of the hwifs and drives, but only on the first call.
 276  * Subsequent calls have no effect (they don't wipe out anything).
 277  *
 278  * This routine is normally called at driver initialization time,
 279  * but may also be called MUCH earlier during kernel "command-line"
 280  * parameter processing.  As such, we cannot depend on any other parts
 281  * of the kernel (such as memory allocation) to be functioning yet.
 282  *
 283  * This is too bad, as otherwise we could dynamically allocate the
 284  * ide_drive_t structs as needed, rather than always consuming memory
 285  * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
 286  *
 287  * FIXME: We should stuff the setup data into __init and copy the
 288  * relevant hwifs/allocate them properly during boot.
 289  */
 290 #define MAGIC_COOKIE 0x12345678
 291 static void __init init_ide_data (void)
 292 {
 293         ide_hwif_t *hwif;
 294         unsigned int index;
 295         static unsigned long magic_cookie = MAGIC_COOKIE;
 296
 297         if (magic_cookie != MAGIC_COOKIE)
 298                 return;         /* already initialized */
 299         magic_cookie = 0;
 300
 301         /* Initialise all interface structures */
 302         for (index = 0; index < MAX_HWIFS; ++index) {
 303                 hwif = &ide_hwifs[index];
 304                 init_hwif_data(hwif, index);
 305                 init_hwif_default(hwif, index);
 306 #if !defined(CONFIG_PPC32) || !defined(CONFIG_PCI)
 307                 hwif->irq = hwif->hw.irq =
 308                         ide_init_default_irq(hwif->io_ports[IDE_DATA_OFFSET]);
 309 #endif
 310         }
 311 #ifdef CONFIG_IDE_ARM
 312         initializing = 1;
 313         ide_arm_init();
 314         initializing = 0;
 315 #endif
 316 }
 317
 318 /**
 319  *      ide_system_bus_speed    -       guess bus speed
 320  *
 321  *      ide_system_bus_speed() returns what we think is the system VESA/PCI
 322  *      bus speed (in MHz). This is used for calculating interface PIO timings.
 323  *      The default is 40 for known PCI systems, 50 otherwise.
 324  *      The "idebus=xx" parameter can be used to override this value.
 325  *      The actual value to be used is computed/displayed the first time
 326  *      through. Drivers should only use this as a last resort.
 327  *
 328  *      Returns a guessed speed in MHz.
 329  */
 330
 331 static int ide_system_bus_speed(void)
 332 {
 333 #ifdef CONFIG_PCI
 334         static struct pci_device_id pci_default[] = {
 335                 { PCI_DEVICE(PCI_ANY_ID, PCI_ANY_ID) },
 336                 { }
 337         };
 338 #else
 339 #define pci_default 0
 340 #endif /* CONFIG_PCI */
 341
 342         if (!system_bus_speed) {
 343                 if (idebus_parameter) {
 344                         /* user supplied value */
 345                         system_bus_speed = idebus_parameter;
 346                 } else if (pci_dev_present(pci_default)) {
 347                         /* safe default value for PCI */
 348                         system_bus_speed = 33;
 349                 } else {
 350                         /* safe default value for VESA and PCI */
 351                         system_bus_speed = 50;
 352                 }
 353                 printk(KERN_INFO "ide: Assuming %dMHz system bus speed "
 354                         "for PIO modes%s\n", system_bus_speed,
 355                         idebus_parameter ? "" : "; override with idebus=xx");
 356         }
 357         return system_bus_speed;
 358 }
 359
 360 #ifdef CONFIG_PROC_FS
 361 struct proc_dir_entry *proc_ide_root;
 362 #endif
 363
 364 static struct resource* hwif_request_region(ide_hwif_t *hwif,
 365                                             unsigned long addr, int num)
 366 {
 367         struct resource *res = request_region(addr, num, hwif->name);
 368
 369         if (!res)
 370                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
 371                                 hwif->name, addr, addr+num-1);
 372         return res;
 373 }
 374
 375 /**
 376  *      ide_hwif_request_regions - request resources for IDE
 377  *      @hwif: interface to use
 378  *
 379  *      Requests all the needed resources for an interface.
 380  *      Right now core IDE code does this work which is deeply wrong.
 381  *      MMIO leaves it to the controller driver,
 382  *      PIO will migrate this way over time.
 383  */
 384
 385 int ide_hwif_request_regions(ide_hwif_t *hwif)
 386 {
 387         unsigned long addr;
 388         unsigned int i;
 389
 390         if (hwif->mmio)
 391                 return 0;
 392         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 393         if (addr && !hwif_request_region(hwif, addr, 1))
 394                 goto control_region_busy;
 395         hwif->straight8 = 0;
 396         addr = hwif->io_ports[IDE_DATA_OFFSET];
 397         if ((addr | 7) == hwif->io_ports[IDE_STATUS_OFFSET]) {
 398                 if (!hwif_request_region(hwif, addr, 8))
 399                         goto data_region_busy;
 400                 hwif->straight8 = 1;
 401                 return 0;
 402         }
 403         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
 404                 addr = hwif->io_ports[i];
 405                 if (!hwif_request_region(hwif, addr, 1)) {
 406                         while (--i)
 407                                 release_region(addr, 1);
 408                         goto data_region_busy;
 409                 }
 410         }
 411         return 0;
 412
 413 data_region_busy:
 414         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 415         if (addr)
 416                 release_region(addr, 1);
 417 control_region_busy:
 418         /* If any errors are return, we drop the hwif interface. */
 419         return -EBUSY;
 420 }
 421
 422 /**
 423  *      ide_hwif_release_regions - free IDE resources
 424  *
 425  *      Note that we only release the standard ports,
 426  *      and do not even try to handle any extra ports
 427  *      allocated for weird IDE interface chipsets.
 428  *
 429  *      Note also that we don't yet handle mmio resources here. More
 430  *      importantly our caller should be doing this so we need to
 431  *      restructure this as a helper function for drivers.
 432  */
 433
 434 void ide_hwif_release_regions(ide_hwif_t *hwif)
 435 {
 436         u32 i = 0;
 437
 438         if (hwif->mmio)
 439                 return;
 440         if (hwif->io_ports[IDE_CONTROL_OFFSET])
 441                 release_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1);
 442         if (hwif->straight8) {
 443                 release_region(hwif->io_ports[IDE_DATA_OFFSET], 8);
 444                 return;
 445         }
 446         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
 447                 if (hwif->io_ports[i])
 448                         release_region(hwif->io_ports[i], 1);
 449 }
 450
 451 /**
 452  *      ide_hwif_restore        -       restore hwif to template
 453  *      @hwif: hwif to update
 454  *      @tmp_hwif: template
 455  *
 456  *      Restore hwif to a previous state by copying most settings
 457  *      from the template.
 458  */
 459
 460 static void ide_hwif_restore(ide_hwif_t *hwif, ide_hwif_t *tmp_hwif)
 461 {
 462         hwif->hwgroup                   = tmp_hwif->hwgroup;
 463
 464         hwif->gendev.parent             = tmp_hwif->gendev.parent;
 465
 466         hwif->proc                      = tmp_hwif->proc;
 467
 468         hwif->major                     = tmp_hwif->major;
 469         hwif->straight8                 = tmp_hwif->straight8;
 470         hwif->bus_state                 = tmp_hwif->bus_state;
 471
 472         hwif->atapi_dma                 = tmp_hwif->atapi_dma;
 473         hwif->ultra_mask                = tmp_hwif->ultra_mask;
 474         hwif->mwdma_mask                = tmp_hwif->mwdma_mask;
 475         hwif->swdma_mask                = tmp_hwif->swdma_mask;
 476
 477         hwif->chipset                   = tmp_hwif->chipset;
 478         hwif->hold                      = tmp_hwif->hold;
 479
 480 #ifdef CONFIG_BLK_DEV_IDEPCI
 481         hwif->pci_dev                   = tmp_hwif->pci_dev;
 482         hwif->cds                       = tmp_hwif->cds;
 483 #endif
 484
 485         hwif->tuneproc                  = tmp_hwif->tuneproc;
 486         hwif->speedproc                 = tmp_hwif->speedproc;
 487         hwif->selectproc                = tmp_hwif->selectproc;
 488         hwif->reset_poll                = tmp_hwif->reset_poll;
 489         hwif->pre_reset                 = tmp_hwif->pre_reset;
 490         hwif->resetproc                 = tmp_hwif->resetproc;
 491         hwif->intrproc                  = tmp_hwif->intrproc;
 492         hwif->maskproc                  = tmp_hwif->maskproc;
 493         hwif->quirkproc                 = tmp_hwif->quirkproc;
 494         hwif->busproc                   = tmp_hwif->busproc;
 495
 496         hwif->ata_input_data            = tmp_hwif->ata_input_data;
 497         hwif->ata_output_data           = tmp_hwif->ata_output_data;
 498         hwif->atapi_input_bytes         = tmp_hwif->atapi_input_bytes;
 499         hwif->atapi_output_bytes        = tmp_hwif->atapi_output_bytes;
 500
 501         hwif->dma_setup                 = tmp_hwif->dma_setup;
 502         hwif->dma_exec_cmd              = tmp_hwif->dma_exec_cmd;
 503         hwif->dma_start                 = tmp_hwif->dma_start;
 504         hwif->ide_dma_end               = tmp_hwif->ide_dma_end;
 505         hwif->ide_dma_check             = tmp_hwif->ide_dma_check;
 506         hwif->ide_dma_on                = tmp_hwif->ide_dma_on;
 507         hwif->dma_off_quietly           = tmp_hwif->dma_off_quietly;
 508         hwif->ide_dma_test_irq          = tmp_hwif->ide_dma_test_irq;
 509         hwif->ide_dma_clear_irq         = tmp_hwif->ide_dma_clear_irq;
 510         hwif->dma_host_on               = tmp_hwif->dma_host_on;
 511         hwif->dma_host_off              = tmp_hwif->dma_host_off;
 512         hwif->ide_dma_lostirq           = tmp_hwif->ide_dma_lostirq;
 513         hwif->ide_dma_timeout           = tmp_hwif->ide_dma_timeout;
 514
 515         hwif->OUTB                      = tmp_hwif->OUTB;
 516         hwif->OUTBSYNC                  = tmp_hwif->OUTBSYNC;
 517         hwif->OUTW                      = tmp_hwif->OUTW;
 518         hwif->OUTSW                     = tmp_hwif->OUTSW;
 519         hwif->OUTSL                     = tmp_hwif->OUTSL;
 520
 521         hwif->INB                       = tmp_hwif->INB;
 522         hwif->INW                       = tmp_hwif->INW;
 523         hwif->INSW                      = tmp_hwif->INSW;
 524         hwif->INSL                      = tmp_hwif->INSL;
 525
 526         hwif->sg_max_nents              = tmp_hwif->sg_max_nents;
 527
 528         hwif->mmio                      = tmp_hwif->mmio;
 529         hwif->rqsize                    = tmp_hwif->rqsize;
 530         hwif->no_lba48                  = tmp_hwif->no_lba48;
 531
 532 #ifndef CONFIG_BLK_DEV_IDECS
 533         hwif->irq                       = tmp_hwif->irq;
 534 #endif
 535
 536         hwif->dma_base                  = tmp_hwif->dma_base;
 537         hwif->dma_master                = tmp_hwif->dma_master;
 538         hwif->dma_command               = tmp_hwif->dma_command;
 539         hwif->dma_vendor1               = tmp_hwif->dma_vendor1;
 540         hwif->dma_status                = tmp_hwif->dma_status;
 541         hwif->dma_vendor3               = tmp_hwif->dma_vendor3;
 542         hwif->dma_prdtable              = tmp_hwif->dma_prdtable;
 543
 544         hwif->config_data               = tmp_hwif->config_data;
 545         hwif->select_data               = tmp_hwif->select_data;
 546         hwif->extra_base                = tmp_hwif->extra_base;
 547         hwif->extra_ports               = tmp_hwif->extra_ports;
 548         hwif->autodma                   = tmp_hwif->autodma;
 549         hwif->udma_four                 = tmp_hwif->udma_four;
 550
 551         hwif->hwif_data                 = tmp_hwif->hwif_data;
 552 }
 553
 554 /**
 555  *      ide_unregister          -       free an IDE interface
 556  *      @index: index of interface (will change soon to a pointer)
 557  *
 558  *      Perform the final unregister of an IDE interface. At the moment
 559  *      we don't refcount interfaces so this will also get split up.
 560  *
 561  *      Locking:
 562  *      The caller must not hold the IDE locks
 563  *      The drive present/vanishing is not yet properly locked
 564  *      Take care with the callbacks. These have been split to avoid
 565  *      deadlocking the IDE layer. The shutdown callback is called
 566  *      before we take the lock and free resources. It is up to the
 567  *      caller to be sure there is no pending I/O here, and that
 568  *      the interface will not be reopened (present/vanishing locking
 569  *      isn't yet done BTW). After we commit to the final kill we
 570  *      call the cleanup callback with the ide locks held.
 571  *
 572  *      Unregister restores the hwif structures to the default state.
 573  *      This is raving bonkers.
 574  */
 575
 576 void ide_unregister(unsigned int index)
 577 {
 578         ide_drive_t *drive;
 579         ide_hwif_t *hwif, *g;
 580         static ide_hwif_t tmp_hwif; /* protected by ide_cfg_sem */
 581         ide_hwgroup_t *hwgroup;
 582         int irq_count = 0, unit;
 583
 584         BUG_ON(index >= MAX_HWIFS);
 585
 586         BUG_ON(in_interrupt());
 587         BUG_ON(irqs_disabled());
 588         down(&ide_cfg_sem);
 589         spin_lock_irq(&ide_lock);
 590         hwif = &ide_hwifs[index];
 591         if (!hwif->present)
 592                 goto abort;
 593         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 594                 drive = &hwif->drives[unit];
 595                 if (!drive->present)
 596                         continue;
 597                 spin_unlock_irq(&ide_lock);
 598                 device_unregister(&drive->gendev);
 599                 wait_for_completion(&drive->gendev_rel_comp);
 600                 spin_lock_irq(&ide_lock);
 601         }
 602         hwif->present = 0;
 603
 604         spin_unlock_irq(&ide_lock);
 605
 606         destroy_proc_ide_interface(hwif);
 607
 608         hwgroup = hwif->hwgroup;
 609         /*
 610          * free the irq if we were the only hwif using it
 611          */
 612         g = hwgroup->hwif;
 613         do {
 614                 if (g->irq == hwif->irq)
 615                         ++irq_count;
 616                 g = g->next;
 617         } while (g != hwgroup->hwif);
 618         if (irq_count == 1)
 619                 free_irq(hwif->irq, hwgroup);
 620
 621         spin_lock_irq(&ide_lock);
 622         /*
 623          * Note that we only release the standard ports,
 624          * and do not even try to handle any extra ports
 625          * allocated for weird IDE interface chipsets.
 626          */
 627         ide_hwif_release_regions(hwif);
 628
 629         /*
 630          * Remove us from the hwgroup, and free
 631          * the hwgroup if we were the only member
 632          */
 633         if (hwif->next == hwif) {
 634                 BUG_ON(hwgroup->hwif != hwif);
 635                 kfree(hwgroup);
 636         } else {
 637                 /* There is another interface in hwgroup.
 638                  * Unlink us, and set hwgroup->drive and ->hwif to
 639                  * something sane.
 640                  */
 641                 g = hwgroup->hwif;
 642                 while (g->next != hwif)
 643                         g = g->next;
 644                 g->next = hwif->next;
 645                 if (hwgroup->hwif == hwif) {
 646                         /* Chose a random hwif for hwgroup->hwif.
 647                          * It's guaranteed that there are no drives
 648                          * left in the hwgroup.
 649                          */
 650                         BUG_ON(hwgroup->drive != NULL);
 651                         hwgroup->hwif = g;
 652                 }
 653                 BUG_ON(hwgroup->hwif == hwif);
 654         }
 655
 656         /* More messed up locking ... */
 657         spin_unlock_irq(&ide_lock);
 658         device_unregister(&hwif->gendev);
 659         wait_for_completion(&hwif->gendev_rel_comp);
 660
 661         /*
 662          * Remove us from the kernel's knowledge
 663          */
 664         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
 665         kfree(hwif->sg_table);
 666         unregister_blkdev(hwif->major, hwif->name);
 667         spin_lock_irq(&ide_lock);
 668
 669         if (hwif->dma_base) {
 670                 (void) ide_release_dma(hwif);
 671
 672                 hwif->dma_base = 0;
 673                 hwif->dma_master = 0;
 674                 hwif->dma_command = 0;
 675                 hwif->dma_vendor1 = 0;
 676                 hwif->dma_status = 0;
 677                 hwif->dma_vendor3 = 0;
 678                 hwif->dma_prdtable = 0;
 679
 680                 hwif->extra_base  = 0;
 681                 hwif->extra_ports = 0;
 682         }
 683
 684         /* copy original settings */
 685         tmp_hwif = *hwif;
 686
 687         /* restore hwif data to pristine status */
 688         init_hwif_data(hwif, index);
 689         init_hwif_default(hwif, index);
 690
 691         ide_hwif_restore(hwif, &tmp_hwif);
 692
 693 abort:
 694         spin_unlock_irq(&ide_lock);
 695         up(&ide_cfg_sem);
 696 }
 697
 698 EXPORT_SYMBOL(ide_unregister);
 699
 700
 701 /**
 702  *      ide_setup_ports         -       set up IDE interface ports
 703  *      @hw: register descriptions
 704  *      @base: base register
 705  *      @offsets: table of register offsets
 706  *      @ctrl: control register
 707  *      @ack_irq: IRQ ack
 708  *      @irq: interrupt lie
 709  *
 710  *      Setup hw_regs_t structure described by parameters.  You
 711  *      may set up the hw structure yourself OR use this routine to
 712  *      do it for you. This is basically a helper
 713  *
 714  */
 715
 716 void ide_setup_ports (  hw_regs_t *hw,
 717                         unsigned long base, int *offsets,
 718                         unsigned long ctrl, unsigned long intr,
 719                         ide_ack_intr_t *ack_intr,
 720 /*
 721  *                      ide_io_ops_t *iops,
 722  */
 723                         int irq)
 724 {
 725         int i;
 726
 727         memset(hw, 0, sizeof(hw_regs_t));
 728         for (i = 0; i < IDE_NR_PORTS; i++) {
 729                 if (offsets[i] == -1) {
 730                         switch(i) {
 731                                 case IDE_CONTROL_OFFSET:
 732                                         hw->io_ports[i] = ctrl;
 733                                         break;
 734 #if defined(CONFIG_AMIGA) || defined(CONFIG_MAC)
 735                                 case IDE_IRQ_OFFSET:
 736                                         hw->io_ports[i] = intr;
 737                                         break;
 738 #endif /* (CONFIG_AMIGA) || (CONFIG_MAC) */
 739                                 default:
 740                                         hw->io_ports[i] = 0;
 741                                         break;
 742                         }
 743                 } else {
 744                         hw->io_ports[i] = base + offsets[i];
 745                 }
 746         }
 747         hw->irq = irq;
 748         hw->dma = NO_DMA;
 749         hw->ack_intr = ack_intr;
 750 /*
 751  *      hw->iops = iops;
 752  */
 753 }
 754
 755 /**
 756  *      ide_register_hw_with_fixup      -       register IDE interface
 757  *      @hw: hardware registers
 758  *      @hwifp: pointer to returned hwif
 759  *      @fixup: fixup function
 760  *
 761  *      Register an IDE interface, specifying exactly the registers etc.
 762  *      Set init=1 iff calling before probes have taken place.
 763  *
 764  *      Returns -1 on error.
 765  */
 766
 767 int ide_register_hw_with_fixup(hw_regs_t *hw, ide_hwif_t **hwifp, void(*fixup)(ide_hwif_t *hwif))
 768 {
 769         int index, retry = 1;
 770         ide_hwif_t *hwif;
 771
 772         do {
 773                 for (index = 0; index < MAX_HWIFS; ++index) {
 774                         hwif = &ide_hwifs[index];
 775                         if (hwif->hw.io_ports[IDE_DATA_OFFSET] == hw->io_ports[IDE_DATA_OFFSET])
 776                                 goto found;
 777                 }
 778                 for (index = 0; index < MAX_HWIFS; ++index) {
 779                         hwif = &ide_hwifs[index];
 780                         if (hwif->hold)
 781                                 continue;
 782                         if ((!hwif->present && !hwif->mate && !initializing) ||
 783                             (!hwif->hw.io_ports[IDE_DATA_OFFSET] && initializing))
 784                                 goto found;
 785                 }
 786                 for (index = 0; index < MAX_HWIFS; index++)
 787                         ide_unregister(index);
 788         } while (retry--);
 789         return -1;
 790 found:
 791         if (hwif->present)
 792                 ide_unregister(index);
 793         else if (!hwif->hold) {
 794                 init_hwif_data(hwif, index);
 795                 init_hwif_default(hwif, index);
 796         }
 797         if (hwif->present)
 798                 return -1;
 799         memcpy(&hwif->hw, hw, sizeof(*hw));
 800         memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->hw.io_ports));
 801         hwif->irq = hw->irq;
 802         hwif->noprobe = 0;
 803         hwif->chipset = hw->chipset;
 804         hwif->gendev.parent = hw->dev;
 805
 806         if (!initializing) {
 807                 probe_hwif_init_with_fixup(hwif, fixup);
 808                 create_proc_ide_interfaces();
 809         }
 810
 811         if (hwifp)
 812                 *hwifp = hwif;
 813
 814         return (initializing || hwif->present) ? index : -1;
 815 }
 816
 817 EXPORT_SYMBOL(ide_register_hw_with_fixup);
 818
 819 int ide_register_hw(hw_regs_t *hw, ide_hwif_t **hwifp)
 820 {
 821         return ide_register_hw_with_fixup(hw, hwifp, NULL);
 822 }
 823
 824 EXPORT_SYMBOL(ide_register_hw);
 825
 826 /*
 827  *      Locks for IDE setting functionality
 828  */
 829
 830 DECLARE_MUTEX(ide_setting_sem);
 831
 832 /**
 833  *      __ide_add_setting       -       add an ide setting option
 834  *      @drive: drive to use
 835  *      @name: setting name
 836  *      @rw: true if the function is read write
 837  *      @read_ioctl: function to call on read
 838  *      @write_ioctl: function to call on write
 839  *      @data_type: type of data
 840  *      @min: range minimum
 841  *      @max: range maximum
 842  *      @mul_factor: multiplication scale
 843  *      @div_factor: divison scale
 844  *      @data: private data field
 845  *      @set: setting
 846  *      @auto_remove: setting auto removal flag
 847  *
 848  *      Removes the setting named from the device if it is present.
 849  *      The function takes the settings_lock to protect against
 850  *      parallel changes. This function must not be called from IRQ
 851  *      context. Returns 0 on success or -1 on failure.
 852  *
 853  *      BUGS: This code is seriously over-engineered. There is also
 854  *      magic about how the driver specific features are setup. If
 855  *      a driver is attached we assume the driver settings are auto
 856  *      remove.
 857  */
 858
 859 static int __ide_add_setting(ide_drive_t *drive, const char *name, int rw, int read_ioctl, int write_ioctl, int data_type, int min, int max, int mul_factor, int div_factor, void *data, ide_procset_t *set, int auto_remove)
 860 {
 861         ide_settings_t **p = (ide_settings_t **) &drive->settings, *setting = NULL;
 862
 863         down(&ide_setting_sem);
 864         while ((*p) && strcmp((*p)->name, name) < 0)
 865                 p = &((*p)->next);
 866         if ((setting = kzalloc(sizeof(*setting), GFP_KERNEL)) == NULL)
 867                 goto abort;
 868         if ((setting->name = kmalloc(strlen(name) + 1, GFP_KERNEL)) == NULL)
 869                 goto abort;
 870         strcpy(setting->name, name);
 871         setting->rw = rw;
 872         setting->read_ioctl = read_ioctl;
 873         setting->write_ioctl = write_ioctl;
 874         setting->data_type = data_type;
 875         setting->min = min;
 876         setting->max = max;
 877         setting->mul_factor = mul_factor;
 878         setting->div_factor = div_factor;
 879         setting->data = data;
 880         setting->set = set;
 881
 882         setting->next = *p;
 883         if (auto_remove)
 884                 setting->auto_remove = 1;
 885         *p = setting;
 886         up(&ide_setting_sem);
 887         return 0;
 888 abort:
 889         up(&ide_setting_sem);
 890         kfree(setting);
 891         return -1;
 892 }
 893
 894 int ide_add_setting(ide_drive_t *drive, const char *name, int rw, int read_ioctl, int write_ioctl, int data_type, int min, int max, int mul_factor, int div_factor, void *data, ide_procset_t *set)
 895 {
 896         return __ide_add_setting(drive, name, rw, read_ioctl, write_ioctl, data_type, min, max, mul_factor, div_factor, data, set, 1);
 897 }
 898
 899 EXPORT_SYMBOL(ide_add_setting);
 900
 901 /**
 902  *      __ide_remove_setting    -       remove an ide setting option
 903  *      @drive: drive to use
 904  *      @name: setting name
 905  *
 906  *      Removes the setting named from the device if it is present.
 907  *      The caller must hold the setting semaphore.
 908  */
 909
 910 static void __ide_remove_setting (ide_drive_t *drive, char *name)
 911 {
 912         ide_settings_t **p, *setting;
 913
 914         p = (ide_settings_t **) &drive->settings;
 915
 916         while ((*p) && strcmp((*p)->name, name))
 917                 p = &((*p)->next);
 918         if ((setting = (*p)) == NULL)
 919                 return;
 920
 921         (*p) = setting->next;
 922
 923         kfree(setting->name);
 924         kfree(setting);
 925 }
 926
 927 /**
 928  *      ide_find_setting_by_ioctl       -       find a drive specific ioctl
 929  *      @drive: drive to scan
 930  *      @cmd: ioctl command to handle
 931  *
 932  *      Scan's the device setting table for a matching entry and returns
 933  *      this or NULL if no entry is found. The caller must hold the
 934  *      setting semaphore
 935  */
 936
 937 static ide_settings_t *ide_find_setting_by_ioctl (ide_drive_t *drive, int cmd)
 938 {
 939         ide_settings_t *setting = drive->settings;
 940
 941         while (setting) {
 942                 if (setting->read_ioctl == cmd || setting->write_ioctl == cmd)
 943                         break;
 944                 setting = setting->next;
 945         }
 946
 947         return setting;
 948 }
 949
 950 /**
 951  *      ide_find_setting_by_name        -       find a drive specific setting
 952  *      @drive: drive to scan
 953  *      @name: setting name
 954  *
 955  *      Scan's the device setting table for a matching entry and returns
 956  *      this or NULL if no entry is found. The caller must hold the
 957  *      setting semaphore
 958  */
 959
 960 ide_settings_t *ide_find_setting_by_name (ide_drive_t *drive, char *name)
 961 {
 962         ide_settings_t *setting = drive->settings;
 963
 964         while (setting) {
 965                 if (strcmp(setting->name, name) == 0)
 966                         break;
 967                 setting = setting->next;
 968         }
 969         return setting;
 970 }
 971
 972 /**
 973  *      auto_remove_settings    -       remove driver specific settings
 974  *      @drive: drive
 975  *
 976  *      Automatically remove all the driver specific settings for this
 977  *      drive. This function may not be called from IRQ context. The
 978  *      caller must hold ide_setting_sem.
 979  */
 980
 981 static void auto_remove_settings (ide_drive_t *drive)
 982 {
 983         ide_settings_t *setting;
 984 repeat:
 985         setting = drive->settings;
 986         while (setting) {
 987                 if (setting->auto_remove) {
 988                         __ide_remove_setting(drive, setting->name);
 989                         goto repeat;
 990                 }
 991                 setting = setting->next;
 992         }
 993 }
 994
 995 /**
 996  *      ide_read_setting        -       read an IDE setting
 997  *      @drive: drive to read from
 998  *      @setting: drive setting
 999  *
1000  *      Read a drive setting and return the value. The caller
1001  *      must hold the ide_setting_sem when making this call.
1002  *
1003  *      BUGS: the data return and error are the same return value
1004  *      so an error -EINVAL and true return of the same value cannot
1005  *      be told apart
1006  */
1007
1008 int ide_read_setting (ide_drive_t *drive, ide_settings_t *setting)
1009 {
1010         int             val = -EINVAL;
1011         unsigned long   flags;
1012
1013         if ((setting->rw & SETTING_READ)) {
1014                 spin_lock_irqsave(&ide_lock, flags);
1015                 switch(setting->data_type) {
1016                         case TYPE_BYTE:
1017                                 val = *((u8 *) setting->data);
1018                                 break;
1019                         case TYPE_SHORT:
1020                                 val = *((u16 *) setting->data);
1021                                 break;
1022                         case TYPE_INT:
1023                         case TYPE_INTA:
1024                                 val = *((u32 *) setting->data);
1025                                 break;
1026                 }
1027                 spin_unlock_irqrestore(&ide_lock, flags);
1028         }
1029         return val;
1030 }
1031
1032 /**
1033  *      ide_spin_wait_hwgroup   -       wait for group
1034  *      @drive: drive in the group
1035  *
1036  *      Wait for an IDE device group to go non busy and then return
1037  *      holding the ide_lock which guards the hwgroup->busy status
1038  *      and right to use it.
1039  */
1040
1041 int ide_spin_wait_hwgroup (ide_drive_t *drive)
1042 {
1043         ide_hwgroup_t *hwgroup = HWGROUP(drive);
1044         unsigned long timeout = jiffies + (3 * HZ);
1045
1046         spin_lock_irq(&ide_lock);
1047
1048         while (hwgroup->busy) {
1049                 unsigned long lflags;
1050                 spin_unlock_irq(&ide_lock);
1051                 local_irq_set(lflags);
1052                 if (time_after(jiffies, timeout)) {
1053                         local_irq_restore(lflags);
1054                         printk(KERN_ERR "%s: channel busy\n", drive->name);
1055                         return -EBUSY;
1056                 }
1057                 local_irq_restore(lflags);
1058                 spin_lock_irq(&ide_lock);
1059         }
1060         return 0;
1061 }
1062
1063 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
1064
1065 /**
1066  *      ide_write_setting       -       read an IDE setting
1067  *      @drive: drive to read from
1068  *      @setting: drive setting
1069  *      @val: value
1070  *
1071  *      Write a drive setting if it is possible. The caller
1072  *      must hold the ide_setting_sem when making this call.
1073  *
1074  *      BUGS: the data return and error are the same return value
1075  *      so an error -EINVAL and true return of the same value cannot
1076  *      be told apart
1077  *
1078  *      FIXME:  This should be changed to enqueue a special request
1079  *      to the driver to change settings, and then wait on a sema for completion.
1080  *      The current scheme of polling is kludgy, though safe enough.
1081  */
1082
1083 int ide_write_setting (ide_drive_t *drive, ide_settings_t *setting, int val)
1084 {
1085         int i;
1086         u32 *p;
1087
1088         if (!capable(CAP_SYS_ADMIN))
1089                 return -EACCES;
1090         if (!(setting->rw & SETTING_WRITE))
1091                 return -EPERM;
1092         if (val < setting->min || val > setting->max)
1093                 return -EINVAL;
1094         if (setting->set)
1095                 return setting->set(drive, val);
1096         if (ide_spin_wait_hwgroup(drive))
1097                 return -EBUSY;
1098         switch (setting->data_type) {
1099                 case TYPE_BYTE:
1100                         *((u8 *) setting->data) = val;
1101                         break;
1102                 case TYPE_SHORT:
1103                         *((u16 *) setting->data) = val;
1104                         break;
1105                 case TYPE_INT:
1106                         *((u32 *) setting->data) = val;
1107                         break;
1108                 case TYPE_INTA:
1109                         p = (u32 *) setting->data;
1110                         for (i = 0; i < 1 << PARTN_BITS; i++, p++)
1111                                 *p = val;
1112                         break;
1113         }
1114         spin_unlock_irq(&ide_lock);
1115         return 0;
1116 }
1117
1118 static int set_io_32bit(ide_drive_t *drive, int arg)
1119 {
1120         drive->io_32bit = arg;
1121 #ifdef CONFIG_BLK_DEV_DTC2278
1122         if (HWIF(drive)->chipset == ide_dtc2278)
1123                 HWIF(drive)->drives[!drive->select.b.unit].io_32bit = arg;
1124 #endif /* CONFIG_BLK_DEV_DTC2278 */
1125         return 0;
1126 }
1127
1128 static int set_using_dma (ide_drive_t *drive, int arg)
1129 {
1130 #ifdef CONFIG_BLK_DEV_IDEDMA
1131         if (!drive->id || !(drive->id->capability & 1))
1132                 return -EPERM;
1133         if (HWIF(drive)->ide_dma_check == NULL)
1134                 return -EPERM;
1135         if (arg) {
1136                 if (ide_set_dma(drive))
1137                         return -EIO;
1138                 if (HWIF(drive)->ide_dma_on(drive)) return -EIO;
1139         } else
1140                 ide_dma_off(drive);
1141         return 0;
1142 #else
1143         return -EPERM;
1144 #endif
1145 }
1146
1147 static int set_pio_mode (ide_drive_t *drive, int arg)
1148 {
1149         struct request rq;
1150
1151         if (!HWIF(drive)->tuneproc)
1152                 return -ENOSYS;
1153         if (drive->special.b.set_tune)
1154                 return -EBUSY;
1155         ide_init_drive_cmd(&rq);
1156         drive->tune_req = (u8) arg;
1157         drive->special.b.set_tune = 1;
1158         (void) ide_do_drive_cmd(drive, &rq, ide_wait);
1159         return 0;
1160 }
1161
1162 static int set_xfer_rate (ide_drive_t *drive, int arg)
1163 {
1164         int err = ide_wait_cmd(drive,
1165                         WIN_SETFEATURES, (u8) arg,
1166                         SETFEATURES_XFER, 0, NULL);
1167
1168         if (!err && arg) {
1169                 ide_set_xfer_rate(drive, (u8) arg);
1170                 ide_driveid_update(drive);
1171         }
1172         return err;
1173 }
1174
1175 /**
1176  *      ide_add_generic_settings        -       generic ide settings
1177  *      @drive: drive being configured
1178  *
1179  *      Add the generic parts of the system settings to the /proc files and
1180  *      ioctls for this IDE device. The caller must not be holding the
1181  *      ide_setting_sem.
1182  */
1183
1184 void ide_add_generic_settings (ide_drive_t *drive)
1185 {
1186 /*
1187  *                        drive         setting name            read/write access                               read ioctl              write ioctl             data type       min     max                             mul_factor      div_factor      data pointer                    set function
1188  */
1189         __ide_add_setting(drive,        "io_32bit",             drive->no_io_32bit ? SETTING_READ : SETTING_RW, HDIO_GET_32BIT,         HDIO_SET_32BIT,         TYPE_BYTE,      0,      1 + (SUPPORT_VLB_SYNC << 1),    1,              1,              &drive->io_32bit,               set_io_32bit,   0);
1190         __ide_add_setting(drive,        "keepsettings",         SETTING_RW,                                     HDIO_GET_KEEPSETTINGS,  HDIO_SET_KEEPSETTINGS,  TYPE_BYTE,      0,      1,                              1,              1,              &drive->keep_settings,          NULL,           0);
1191         __ide_add_setting(drive,        "nice1",                SETTING_RW,                                     -1,                     -1,                     TYPE_BYTE,      0,      1,                              1,              1,              &drive->nice1,                  NULL,           0);
1192         __ide_add_setting(drive,        "pio_mode",             SETTING_WRITE,                                  -1,                     HDIO_SET_PIO_MODE,      TYPE_BYTE,      0,      255,                            1,              1,              NULL,                           set_pio_mode,   0);
1193         __ide_add_setting(drive,        "unmaskirq",            drive->no_unmask ? SETTING_READ : SETTING_RW,   HDIO_GET_UNMASKINTR,    HDIO_SET_UNMASKINTR,    TYPE_BYTE,      0,      1,                              1,              1,              &drive->unmask,                 NULL,           0);
1194         __ide_add_setting(drive,        "using_dma",            SETTING_RW,                                     HDIO_GET_DMA,           HDIO_SET_DMA,           TYPE_BYTE,      0,      1,                              1,              1,              &drive->using_dma,              set_using_dma,  0);
1195         __ide_add_setting(drive,        "init_speed",           SETTING_RW,                                     -1,                     -1,                     TYPE_BYTE,      0,      70,                             1,              1,              &drive->init_speed,             NULL,           0);
1196         __ide_add_setting(drive,        "current_speed",        SETTING_RW,                                     -1,                     -1,                     TYPE_BYTE,      0,      70,                             1,              1,              &drive->current_speed,          set_xfer_rate,  0);
1197         __ide_add_setting(drive,        "number",               SETTING_RW,                                     -1,                     -1,                     TYPE_BYTE,      0,      3,                              1,              1,              &drive->dn,                     NULL,           0);
1198 }
1199
1200 /**
1201  *      system_bus_clock        -       clock guess
1202  *
1203  *      External version of the bus clock guess used by very old IDE drivers
1204  *      for things like VLB timings. Should not be used.
1205  */
1206
1207 int system_bus_clock (void)
1208 {
1209         return((int) ((!system_bus_speed) ? ide_system_bus_speed() : system_bus_speed ));
1210 }
1211
1212 EXPORT_SYMBOL(system_bus_clock);
1213
1214 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
1215 {
1216         ide_drive_t *drive = dev->driver_data;
1217         ide_hwif_t *hwif = HWIF(drive);
1218         struct request rq;
1219         struct request_pm_state rqpm;
1220         ide_task_t args;
1221
1222         /* Call ACPI _GTM only once */
1223         if (!(drive->dn % 2))
1224                 ide_acpi_get_timing(hwif);
1225
1226         memset(&rq, 0, sizeof(rq));
1227         memset(&rqpm, 0, sizeof(rqpm));
1228         memset(&args, 0, sizeof(args));
1229         rq.cmd_type = REQ_TYPE_PM_SUSPEND;
1230         rq.special = &args;
1231         rq.data = &rqpm;
1232         rqpm.pm_step = ide_pm_state_start_suspend;
1233         if (mesg.event == PM_EVENT_PRETHAW)
1234                 mesg.event = PM_EVENT_FREEZE;
1235         rqpm.pm_state = mesg.event;
1236
1237         return ide_do_drive_cmd(drive, &rq, ide_wait);
1238 }
1239
1240 static int generic_ide_resume(struct device *dev)
1241 {
1242         ide_drive_t *drive = dev->driver_data;
1243         ide_hwif_t *hwif = HWIF(drive);
1244         struct request rq;
1245         struct request_pm_state rqpm;
1246         ide_task_t args;
1247
1248         /* Call ACPI _STM only once */
1249         if (!(drive->dn % 2))
1250                 ide_acpi_push_timing(hwif);
1251
1252         ide_acpi_exec_tfs(drive);
1253
1254         memset(&rq, 0, sizeof(rq));
1255         memset(&rqpm, 0, sizeof(rqpm));
1256         memset(&args, 0, sizeof(args));
1257         rq.cmd_type = REQ_TYPE_PM_RESUME;
1258         rq.special = &args;
1259         rq.data = &rqpm;
1260         rqpm.pm_step = ide_pm_state_start_resume;
1261         rqpm.pm_state = PM_EVENT_ON;
1262
1263         return ide_do_drive_cmd(drive, &rq, ide_head_wait);
1264 }
1265
1266 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
1267                         unsigned int cmd, unsigned long arg)
1268 {
1269         ide_settings_t *setting;
1270         ide_driver_t *drv;
1271         int err = 0;
1272         void __user *p = (void __user *)arg;
1273
1274         down(&ide_setting_sem);
1275         if ((setting = ide_find_setting_by_ioctl(drive, cmd)) != NULL) {
1276                 if (cmd == setting->read_ioctl) {
1277                         err = ide_read_setting(drive, setting);
1278                         up(&ide_setting_sem);
1279                         return err >= 0 ? put_user(err, (long __user *)arg) : err;
1280                 } else {
1281                         if (bdev != bdev->bd_contains)
1282                                 err = -EINVAL;
1283                         else
1284                                 err = ide_write_setting(drive, setting, arg);
1285                         up(&ide_setting_sem);
1286                         return err;
1287                 }
1288         }
1289         up(&ide_setting_sem);
1290
1291         switch (cmd) {
1292                 case HDIO_OBSOLETE_IDENTITY:
1293                 case HDIO_GET_IDENTITY:
1294                         if (bdev != bdev->bd_contains)
1295                                 return -EINVAL;
1296                         if (drive->id_read == 0)
1297                                 return -ENOMSG;
1298                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
1299                                 return -EFAULT;
1300                         return 0;
1301
1302                 case HDIO_GET_NICE:
1303                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
1304                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
1305                                         drive->nice0            <<      IDE_NICE_0              |
1306                                         drive->nice1            <<      IDE_NICE_1              |
1307                                         drive->nice2            <<      IDE_NICE_2,
1308                                         (long __user *) arg);
1309
1310 #ifdef CONFIG_IDE_TASK_IOCTL
1311                 case HDIO_DRIVE_TASKFILE:
1312                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1313                                 return -EACCES;
1314                         switch(drive->media) {
1315                                 case ide_disk:
1316                                         return ide_taskfile_ioctl(drive, cmd, arg);
1317                                 default:
1318                                         return -ENOMSG;
1319                         }
1320 #endif /* CONFIG_IDE_TASK_IOCTL */
1321
1322                 case HDIO_DRIVE_CMD:
1323                         if (!capable(CAP_SYS_RAWIO))
1324                                 return -EACCES;
1325                         return ide_cmd_ioctl(drive, cmd, arg);
1326
1327                 case HDIO_DRIVE_TASK:
1328                         if (!capable(CAP_SYS_RAWIO))
1329                                 return -EACCES;
1330                         return ide_task_ioctl(drive, cmd, arg);
1331
1332                 case HDIO_SCAN_HWIF:
1333                 {
1334                         hw_regs_t hw;
1335                         int args[3];
1336                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1337                         if (copy_from_user(args, p, 3 * sizeof(int)))
1338                                 return -EFAULT;
1339                         memset(&hw, 0, sizeof(hw));
1340                         ide_init_hwif_ports(&hw, (unsigned long) args[0],
1341                                             (unsigned long) args[1], NULL);
1342                         hw.irq = args[2];
1343                         if (ide_register_hw(&hw, NULL) == -1)
1344                                 return -EIO;
1345                         return 0;
1346                 }
1347                 case HDIO_UNREGISTER_HWIF:
1348                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1349                         /* (arg > MAX_HWIFS) checked in function */
1350                         ide_unregister(arg);
1351                         return 0;
1352                 case HDIO_SET_NICE:
1353                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1354                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
1355                                 return -EPERM;
1356                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
1357                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
1358                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
1359                                 drive->dsc_overlap = 0;
1360                                 return -EPERM;
1361                         }
1362                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
1363                         return 0;
1364                 case HDIO_DRIVE_RESET:
1365                 {
1366                         unsigned long flags;
1367                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1368
1369                         /*
1370                          *      Abort the current command on the
1371                          *      group if there is one, taking
1372                          *      care not to allow anything else
1373                          *      to be queued and to die on the
1374                          *      spot if we miss one somehow
1375                          */
1376
1377                         spin_lock_irqsave(&ide_lock, flags);
1378
1379                         if (HWGROUP(drive)->resetting) {
1380                                 spin_unlock_irqrestore(&ide_lock, flags);
1381                                 return -EBUSY;
1382                         }
1383
1384                         ide_abort(drive, "drive reset");
1385
1386                         BUG_ON(HWGROUP(drive)->handler);
1387
1388                         /* Ensure nothing gets queued after we
1389                            drop the lock. Reset will clear the busy */
1390
1391                         HWGROUP(drive)->busy = 1;
1392                         spin_unlock_irqrestore(&ide_lock, flags);
1393                         (void) ide_do_reset(drive);
1394
1395                         return 0;
1396                 }
1397
1398                 case CDROMEJECT:
1399                 case CDROMCLOSETRAY:
1400                         return scsi_cmd_ioctl(file, bdev->bd_disk, cmd, p);
1401
1402                 case HDIO_GET_BUSSTATE:
1403                         if (!capable(CAP_SYS_ADMIN))
1404                                 return -EACCES;
1405                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
1406                                 return -EFAULT;
1407                         return 0;
1408
1409                 case HDIO_SET_BUSSTATE:
1410                         if (!capable(CAP_SYS_ADMIN))
1411                                 return -EACCES;
1412                         if (HWIF(drive)->busproc)
1413                                 return HWIF(drive)->busproc(drive, (int)arg);
1414                         return -EOPNOTSUPP;
1415                 default:
1416                         return -EINVAL;
1417         }
1418 }
1419
1420 EXPORT_SYMBOL(generic_ide_ioctl);
1421
1422 /*
1423  * stridx() returns the offset of c within s,
1424  * or -1 if c is '\0' or not found within s.
1425  */
1426 static int __init stridx (const char *s, char c)
1427 {
1428         char *i = strchr(s, c);
1429         return (i && c) ? i - s : -1;
1430 }
1431
1432 /*
1433  * match_parm() does parsing for ide_setup():
1434  *
1435  * 1. the first char of s must be '='.
1436  * 2. if the remainder matches one of the supplied keywords,
1437  *     the index (1 based) of the keyword is negated and returned.
1438  * 3. if the remainder is a series of no more than max_vals numbers
1439  *     separated by commas, the numbers are saved in vals[] and a
1440  *     count of how many were saved is returned.  Base10 is assumed,
1441  *     and base16 is allowed when prefixed with "0x".
1442  * 4. otherwise, zero is returned.
1443  */
1444 static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals)
1445 {
1446         static const char *decimal = "0123456789";
1447         static const char *hex = "0123456789abcdef";
1448         int i, n;
1449
1450         if (*s++ == '=') {
1451                 /*
1452                  * Try matching against the supplied keywords,
1453                  * and return -(index+1) if we match one
1454                  */
1455                 if (keywords != NULL) {
1456                         for (i = 0; *keywords != NULL; ++i) {
1457                                 if (!strcmp(s, *keywords++))
1458                                         return -(i+1);
1459                         }
1460                 }
1461                 /*
1462                  * Look for a series of no more than "max_vals"
1463                  * numeric values separated by commas, in base10,
1464                  * or base16 when prefixed with "0x".
1465                  * Return a count of how many were found.
1466                  */
1467                 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
1468                         vals[n] = i;
1469                         while ((i = stridx(decimal, *++s)) >= 0)
1470                                 vals[n] = (vals[n] * 10) + i;
1471                         if (*s == 'x' && !vals[n]) {
1472                                 while ((i = stridx(hex, *++s)) >= 0)
1473                                         vals[n] = (vals[n] * 0x10) + i;
1474                         }
1475                         if (++n == max_vals)
1476                                 break;
1477                         if (*s == ',' || *s == ';')
1478                                 ++s;
1479                 }
1480                 if (!*s)
1481                         return n;
1482         }
1483         return 0;       /* zero = nothing matched */
1484 }
1485
1486 #ifdef CONFIG_BLK_DEV_ALI14XX
1487 extern int probe_ali14xx;
1488 extern int ali14xx_init(void);
1489 #endif
1490 #ifdef CONFIG_BLK_DEV_UMC8672
1491 extern int probe_umc8672;
1492 extern int umc8672_init(void);
1493 #endif
1494 #ifdef CONFIG_BLK_DEV_DTC2278
1495 extern int probe_dtc2278;
1496 extern int dtc2278_init(void);
1497 #endif
1498 #ifdef CONFIG_BLK_DEV_HT6560B
1499 extern int probe_ht6560b;
1500 extern int ht6560b_init(void);
1501 #endif
1502 #ifdef CONFIG_BLK_DEV_QD65XX
1503 extern int probe_qd65xx;
1504 extern int qd65xx_init(void);
1505 #endif
1506
1507 static int __initdata is_chipset_set[MAX_HWIFS];
1508
1509 /*
1510  * ide_setup() gets called VERY EARLY during initialization,
1511  * to handle kernel "command line" strings beginning with "hdx=" or "ide".
1512  *
1513  * Remember to update Documentation/ide.txt if you change something here.
1514  */
1515 static int __init ide_setup(char *s)
1516 {
1517         int i, vals[3];
1518         ide_hwif_t *hwif;
1519         ide_drive_t *drive;
1520         unsigned int hw, unit;
1521         const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
1522         const char max_hwif  = '0' + (MAX_HWIFS - 1);
1523
1524
1525         if (strncmp(s,"hd",2) == 0 && s[2] == '=')      /* hd= is for hd.c   */
1526                 return 0;                               /* driver and not us */
1527
1528         if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2))
1529                 return 0;
1530
1531         printk(KERN_INFO "ide_setup: %s", s);
1532         init_ide_data ();
1533
1534 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
1535         if (!strcmp(s, "ide=doubler")) {
1536                 extern int ide_doubler;
1537
1538                 printk(" : Enabled support for IDE doublers\n");
1539                 ide_doubler = 1;
1540                 return 1;
1541         }
1542 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
1543
1544         if (!strcmp(s, "ide=nodma")) {
1545                 printk(" : Prevented DMA\n");
1546                 noautodma = 1;
1547                 return 1;
1548         }
1549
1550 #ifdef CONFIG_BLK_DEV_IDEPCI
1551         if (!strcmp(s, "ide=reverse")) {
1552                 ide_scan_direction = 1;
1553                 printk(" : Enabled support for IDE inverse scan order.\n");
1554                 return 1;
1555         }
1556 #endif /* CONFIG_BLK_DEV_IDEPCI */
1557
1558 #ifdef CONFIG_BLK_DEV_IDEACPI
1559         if (!strcmp(s, "ide=noacpi")) {
1560                 //printk(" : Disable IDE ACPI support.\n");
1561                 ide_noacpi = 1;
1562                 return 1;
1563         }
1564         if (!strcmp(s, "ide=acpigtf")) {
1565                 //printk(" : Enable IDE ACPI _GTF support.\n");
1566                 ide_noacpitfs = 0;
1567                 return 1;
1568         }
1569         if (!strcmp(s, "ide=acpionboot")) {
1570                 //printk(" : Call IDE ACPI methods on boot.\n");
1571                 ide_noacpionboot = 0;
1572                 return 1;
1573         }
1574 #endif /* CONFIG_BLK_DEV_IDEACPI */
1575
1576         /*
1577          * Look for drive options:  "hdx="
1578          */
1579         if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
1580                 const char *hd_words[] = {
1581                         "none", "noprobe", "nowerr", "cdrom", "minus5",
1582                         "autotune", "noautotune", "minus8", "swapdata", "bswap",
1583                         "noflush", "remap", "remap63", "scsi", NULL };
1584                 unit = s[2] - 'a';
1585                 hw   = unit / MAX_DRIVES;
1586                 unit = unit % MAX_DRIVES;
1587                 hwif = &ide_hwifs[hw];
1588                 drive = &hwif->drives[unit];
1589                 if (strncmp(s + 4, "ide-", 4) == 0) {
1590                         strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req));
1591                         goto done;
1592                 }
1593                 switch (match_parm(&s[3], hd_words, vals, 3)) {
1594                         case -1: /* "none" */
1595                         case -2: /* "noprobe" */
1596                                 drive->noprobe = 1;
1597                                 goto done;
1598                         case -3: /* "nowerr" */
1599                                 drive->bad_wstat = BAD_R_STAT;
1600                                 hwif->noprobe = 0;
1601                                 goto done;
1602                         case -4: /* "cdrom" */
1603                                 drive->present = 1;
1604                                 drive->media = ide_cdrom;
1605                                 /* an ATAPI device ignores DRDY */
1606                                 drive->ready_stat = 0;
1607                                 hwif->noprobe = 0;
1608                                 goto done;
1609                         case -6: /* "autotune" */
1610                                 drive->autotune = IDE_TUNE_AUTO;
1611                                 goto obsolete_option;
1612                         case -7: /* "noautotune" */
1613                                 drive->autotune = IDE_TUNE_NOAUTO;
1614                                 goto obsolete_option;
1615                         case -9: /* "swapdata" */
1616                         case -10: /* "bswap" */
1617                                 drive->bswap = 1;
1618                                 goto done;
1619                         case -11: /* noflush */
1620                                 drive->noflush = 1;
1621                                 goto done;
1622                         case -12: /* "remap" */
1623                                 drive->remap_0_to_1 = 1;
1624                                 goto done;
1625                         case -13: /* "remap63" */
1626                                 drive->sect0 = 63;
1627                                 goto done;
1628                         case -14: /* "scsi" */
1629                                 drive->scsi = 1;
1630                                 goto done;
1631                         case 3: /* cyl,head,sect */
1632                                 drive->media    = ide_disk;
1633                                 drive->ready_stat = READY_STAT;
1634                                 drive->cyl      = drive->bios_cyl  = vals[0];
1635                                 drive->head     = drive->bios_head = vals[1];
1636                                 drive->sect     = drive->bios_sect = vals[2];
1637                                 drive->present  = 1;
1638                                 drive->forced_geom = 1;
1639                                 hwif->noprobe = 0;
1640                                 goto done;
1641                         default:
1642                                 goto bad_option;
1643                 }
1644         }
1645
1646         if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
1647                 goto bad_option;
1648         /*
1649          * Look for bus speed option:  "idebus="
1650          */
1651         if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
1652                 if (match_parm(&s[6], NULL, vals, 1) != 1)
1653                         goto bad_option;
1654                 if (vals[0] >= 20 && vals[0] <= 66) {
1655                         idebus_parameter = vals[0];
1656                 } else
1657                         printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
1658                 goto done;
1659         }
1660         /*
1661          * Look for interface options:  "idex="
1662          */
1663         if (s[3] >= '0' && s[3] <= max_hwif) {
1664                 /*
1665                  * Be VERY CAREFUL changing this: note hardcoded indexes below
1666                  * (-8, -9, -10) are reserved to ease the hardcoding.
1667                  */
1668                 static const char *ide_words[] = {
1669                         "noprobe", "serialize", "minus3", "minus4",
1670                         "reset", "dma", "ata66", "minus8", "minus9",
1671                         "minus10", "four", "qd65xx", "ht6560b", "cmd640_vlb",
1672                         "dtc2278", "umc8672", "ali14xx", NULL };
1673                 hw = s[3] - '0';
1674                 hwif = &ide_hwifs[hw];
1675                 i = match_parm(&s[4], ide_words, vals, 3);
1676
1677                 /*
1678                  * Cryptic check to ensure chipset not already set for hwif.
1679                  * Note: we can't depend on hwif->chipset here.
1680                  */
1681                 if ((i >= -18 && i <= -11) || (i > 0 && i <= 3)) {
1682                         /* chipset already specified */
1683                         if (is_chipset_set[hw])
1684                                 goto bad_option;
1685                         if (i > -18 && i <= -11) {
1686                                 /* these drivers are for "ide0=" only */
1687                                 if (hw != 0)
1688                                         goto bad_hwif;
1689                                 /* chipset already specified for 2nd port */
1690                                 if (is_chipset_set[hw+1])
1691                                         goto bad_option;
1692                         }
1693                         is_chipset_set[hw] = 1;
1694                         printk("\n");
1695                 }
1696
1697                 switch (i) {
1698 #ifdef CONFIG_BLK_DEV_ALI14XX
1699                         case -17: /* "ali14xx" */
1700                                 probe_ali14xx = 1;
1701                                 goto done;
1702 #endif
1703 #ifdef CONFIG_BLK_DEV_UMC8672
1704                         case -16: /* "umc8672" */
1705                                 probe_umc8672 = 1;
1706                                 goto done;
1707 #endif
1708 #ifdef CONFIG_BLK_DEV_DTC2278
1709                         case -15: /* "dtc2278" */
1710                                 probe_dtc2278 = 1;
1711                                 goto done;
1712 #endif
1713 #ifdef CONFIG_BLK_DEV_CMD640
1714                         case -14: /* "cmd640_vlb" */
1715                         {
1716                                 extern int cmd640_vlb; /* flag for cmd640.c */
1717                                 cmd640_vlb = 1;
1718                                 goto done;
1719                         }
1720 #endif
1721 #ifdef CONFIG_BLK_DEV_HT6560B
1722                         case -13: /* "ht6560b" */
1723                                 probe_ht6560b = 1;
1724                                 goto done;
1725 #endif
1726 #ifdef CONFIG_BLK_DEV_QD65XX
1727                         case -12: /* "qd65xx" */
1728                                 probe_qd65xx = 1;
1729                                 goto done;
1730 #endif
1731 #ifdef CONFIG_BLK_DEV_4DRIVES
1732                         case -11: /* "four" drives on one set of ports */
1733                         {
1734                                 ide_hwif_t *mate = &ide_hwifs[hw^1];
1735                                 mate->drives[0].select.all ^= 0x20;
1736                                 mate->drives[1].select.all ^= 0x20;
1737                                 hwif->chipset = mate->chipset = ide_4drives;
1738                                 mate->irq = hwif->irq;
1739                                 memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
1740                                 hwif->mate = mate;
1741                                 mate->mate = hwif;
1742                                 hwif->serialized = mate->serialized = 1;
1743                                 goto obsolete_option;
1744                         }
1745 #endif /* CONFIG_BLK_DEV_4DRIVES */
1746                         case -10: /* minus10 */
1747                         case -9: /* minus9 */
1748                         case -8: /* minus8 */
1749                         case -4:
1750                         case -3:
1751                                 goto bad_option;
1752                         case -7: /* ata66 */
1753 #ifdef CONFIG_BLK_DEV_IDEPCI
1754                                 hwif->udma_four = 1;
1755                                 goto obsolete_option;
1756 #else
1757                                 goto bad_hwif;
1758 #endif
1759                         case -6: /* dma */
1760                                 hwif->autodma = 1;
1761                                 goto obsolete_option;
1762                         case -5: /* "reset" */
1763                                 hwif->reset = 1;
1764                                 goto obsolete_option;
1765                         case -2: /* "serialize" */
1766                                 hwif->mate = &ide_hwifs[hw^1];
1767                                 hwif->mate->mate = hwif;
1768                                 hwif->serialized = hwif->mate->serialized = 1;
1769                                 goto obsolete_option;
1770
1771                         case -1: /* "noprobe" */
1772                                 hwif->noprobe = 1;
1773                                 goto done;
1774
1775                         case 1: /* base */
1776                                 vals[1] = vals[0] + 0x206; /* default ctl */
1777                         case 2: /* base,ctl */
1778                                 vals[2] = 0;    /* default irq = probe for it */
1779                         case 3: /* base,ctl,irq */
1780                                 hwif->hw.irq = vals[2];
1781                                 ide_init_hwif_ports(&hwif->hw, (unsigned long) vals[0], (unsigned long) vals[1], &hwif->irq);
1782                                 memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->io_ports));
1783                                 hwif->irq      = vals[2];
1784                                 hwif->noprobe  = 0;
1785                                 hwif->chipset  = ide_forced;
1786                                 goto obsolete_option;
1787
1788                         case 0: goto bad_option;
1789                         default:
1790                                 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
1791                                 return 1;
1792                 }
1793         }
1794 bad_option:
1795         printk(" -- BAD OPTION\n");
1796         return 1;
1797 obsolete_option:
1798         printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n");
1799         return 1;
1800 bad_hwif:
1801         printk("-- NOT SUPPORTED ON ide%d", hw);
1802 done:
1803         printk("\n");
1804         return 1;
1805 }
1806
1807 extern void __init pnpide_init(void);
1808 extern void __exit pnpide_exit(void);
1809 extern void __init h8300_ide_init(void);
1810
1811 /*
1812  * probe_for_hwifs() finds/initializes "known" IDE interfaces
1813  */
1814 static void __init probe_for_hwifs (void)
1815 {
1816 #ifdef CONFIG_BLK_DEV_IDEPCI
1817         ide_scan_pcibus(ide_scan_direction);
1818 #endif /* CONFIG_BLK_DEV_IDEPCI */
1819
1820 #ifdef CONFIG_ETRAX_IDE
1821         {
1822                 extern void init_e100_ide(void);
1823                 init_e100_ide();
1824         }
1825 #endif /* CONFIG_ETRAX_IDE */
1826 #ifdef CONFIG_BLK_DEV_CMD640
1827         {
1828                 extern void ide_probe_for_cmd640x(void);
1829                 ide_probe_for_cmd640x();
1830         }
1831 #endif /* CONFIG_BLK_DEV_CMD640 */
1832 #ifdef CONFIG_BLK_DEV_IDE_PMAC
1833         {
1834                 extern int pmac_ide_probe(void);
1835                 (void)pmac_ide_probe();
1836         }
1837 #endif /* CONFIG_BLK_DEV_IDE_PMAC */
1838 #ifdef CONFIG_BLK_DEV_GAYLE
1839         {
1840                 extern void gayle_init(void);
1841                 gayle_init();
1842         }
1843 #endif /* CONFIG_BLK_DEV_GAYLE */
1844 #ifdef CONFIG_BLK_DEV_FALCON_IDE
1845         {
1846                 extern void falconide_init(void);
1847                 falconide_init();
1848         }
1849 #endif /* CONFIG_BLK_DEV_FALCON_IDE */
1850 #ifdef CONFIG_BLK_DEV_MAC_IDE
1851         {
1852                 extern void macide_init(void);
1853                 macide_init();
1854         }
1855 #endif /* CONFIG_BLK_DEV_MAC_IDE */
1856 #ifdef CONFIG_BLK_DEV_Q40IDE
1857         {
1858                 extern void q40ide_init(void);
1859                 q40ide_init();
1860         }
1861 #endif /* CONFIG_BLK_DEV_Q40IDE */
1862 #ifdef CONFIG_BLK_DEV_BUDDHA
1863         {
1864                 extern void buddha_init(void);
1865                 buddha_init();
1866         }
1867 #endif /* CONFIG_BLK_DEV_BUDDHA */
1868 #ifdef CONFIG_BLK_DEV_IDEPNP
1869         pnpide_init();
1870 #endif
1871 #ifdef CONFIG_H8300
1872         h8300_ide_init();
1873 #endif
1874 }
1875
1876 void ide_register_subdriver(ide_drive_t *drive, ide_driver_t *driver)
1877 {
1878 #ifdef CONFIG_PROC_FS
1879         ide_add_proc_entries(drive->proc, driver->proc, drive);
1880 #endif
1881 }
1882
1883 EXPORT_SYMBOL(ide_register_subdriver);
1884
1885 /**
1886  *      ide_unregister_subdriver        -       disconnect drive from driver
1887  *      @drive: drive to unplug
1888  *      @driver: driver
1889  *
1890  *      Disconnect a drive from the driver it was attached to and then
1891  *      clean up the various proc files and other objects attached to it.
1892  *
1893  *      Takes ide_setting_sem and ide_lock.
1894  *      Caller must hold none of the locks.
1895  */
1896
1897 void ide_unregister_subdriver(ide_drive_t *drive, ide_driver_t *driver)
1898 {
1899         unsigned long flags;
1900
1901 #ifdef CONFIG_PROC_FS
1902         ide_remove_proc_entries(drive->proc, driver->proc);
1903 #endif
1904         down(&ide_setting_sem);
1905         spin_lock_irqsave(&ide_lock, flags);
1906         /*
1907          * ide_setting_sem protects the settings list
1908          * ide_lock protects the use of settings
1909          *
1910          * so we need to hold both, ide_settings_sem because we want to
1911          * modify the settings list, and ide_lock because we cannot take
1912          * a setting out that is being used.
1913          *
1914          * OTOH both ide_{read,write}_setting are only ever used under
1915          * ide_setting_sem.
1916          */
1917         auto_remove_settings(drive);
1918         spin_unlock_irqrestore(&ide_lock, flags);
1919         up(&ide_setting_sem);
1920 }
1921
1922 EXPORT_SYMBOL(ide_unregister_subdriver);
1923
1924 /*
1925  * Probe module
1926  */
1927
1928 EXPORT_SYMBOL(ide_lock);
1929
1930 static int ide_bus_match(struct device *dev, struct device_driver *drv)
1931 {
1932         return 1;
1933 }
1934
1935 static char *media_string(ide_drive_t *drive)
1936 {
1937         switch (drive->media) {
1938         case ide_disk:
1939                 return "disk";
1940         case ide_cdrom:
1941                 return "cdrom";
1942         case ide_tape:
1943                 return "tape";
1944         case ide_floppy:
1945                 return "floppy";
1946         default:
1947                 return "UNKNOWN";
1948         }
1949 }
1950
1951 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
1952 {
1953         ide_drive_t *drive = to_ide_device(dev);
1954         return sprintf(buf, "%s\n", media_string(drive));
1955 }
1956
1957 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
1958 {
1959         ide_drive_t *drive = to_ide_device(dev);
1960         return sprintf(buf, "%s\n", drive->name);
1961 }
1962
1963 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
1964 {
1965         ide_drive_t *drive = to_ide_device(dev);
1966         return sprintf(buf, "ide:m-%s\n", media_string(drive));
1967 }
1968
1969 static struct device_attribute ide_dev_attrs[] = {
1970         __ATTR_RO(media),
1971         __ATTR_RO(drivename),
1972         __ATTR_RO(modalias),
1973         __ATTR_NULL
1974 };
1975
1976 static int ide_uevent(struct device *dev, char **envp, int num_envp,
1977                       char *buffer, int buffer_size)
1978 {
1979         ide_drive_t *drive = to_ide_device(dev);
1980         int i = 0;
1981         int length = 0;
1982
1983         add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
1984                        "MEDIA=%s", media_string(drive));
1985         add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
1986                        "DRIVENAME=%s", drive->name);
1987         add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
1988                        "MODALIAS=ide:m-%s", media_string(drive));
1989         envp[i] = NULL;
1990         return 0;
1991 }
1992
1993 static int generic_ide_probe(struct device *dev)
1994 {
1995         ide_drive_t *drive = to_ide_device(dev);
1996         ide_driver_t *drv = to_ide_driver(dev->driver);
1997
1998         return drv->probe ? drv->probe(drive) : -ENODEV;
1999 }
2000
2001 static int generic_ide_remove(struct device *dev)
2002 {
2003         ide_drive_t *drive = to_ide_device(dev);
2004         ide_driver_t *drv = to_ide_driver(dev->driver);
2005
2006         if (drv->remove)
2007                 drv->remove(drive);
2008
2009         return 0;
2010 }
2011
2012 static void generic_ide_shutdown(struct device *dev)
2013 {
2014         ide_drive_t *drive = to_ide_device(dev);
2015         ide_driver_t *drv = to_ide_driver(dev->driver);
2016
2017         if (dev->driver && drv->shutdown)
2018                 drv->shutdown(drive);
2019 }
2020
2021 struct bus_type ide_bus_type = {
2022         .name           = "ide",
2023         .match          = ide_bus_match,
2024         .uevent         = ide_uevent,
2025         .probe          = generic_ide_probe,
2026         .remove         = generic_ide_remove,
2027         .shutdown       = generic_ide_shutdown,
2028         .dev_attrs      = ide_dev_attrs,
2029         .suspend        = generic_ide_suspend,
2030         .resume         = generic_ide_resume,
2031 };
2032
2033 EXPORT_SYMBOL_GPL(ide_bus_type);
2034
2035 /*
2036  * This is gets invoked once during initialization, to set *everything* up
2037  */
2038 static int __init ide_init(void)
2039 {
2040         int ret;
2041
2042         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver " REVISION "\n");
2043         system_bus_speed = ide_system_bus_speed();
2044
2045         ret = bus_register(&ide_bus_type);
2046         if (ret < 0) {
2047                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
2048                 return ret;
2049         }
2050
2051         init_ide_data();
2052
2053 #ifdef CONFIG_PROC_FS
2054         proc_ide_root = proc_mkdir("ide", NULL);
2055 #endif
2056
2057 #ifdef CONFIG_BLK_DEV_ALI14XX
2058         if (probe_ali14xx)
2059                 (void)ali14xx_init();
2060 #endif
2061 #ifdef CONFIG_BLK_DEV_UMC8672
2062         if (probe_umc8672)
2063                 (void)umc8672_init();
2064 #endif
2065 #ifdef CONFIG_BLK_DEV_DTC2278
2066         if (probe_dtc2278)
2067                 (void)dtc2278_init();
2068 #endif
2069 #ifdef CONFIG_BLK_DEV_HT6560B
2070         if (probe_ht6560b)
2071                 (void)ht6560b_init();
2072 #endif
2073 #ifdef CONFIG_BLK_DEV_QD65XX
2074         if (probe_qd65xx)
2075                 (void)qd65xx_init();
2076 #endif
2077
2078         initializing = 1;
2079         /* Probe for special PCI and other "known" interface chipsets. */
2080         probe_for_hwifs();
2081         initializing = 0;
2082
2083 #ifdef CONFIG_PROC_FS
2084         proc_ide_create();
2085 #endif
2086         return 0;
2087 }
2088
2089 #ifdef MODULE
2090 static char *options = NULL;
2091 module_param(options, charp, 0);
2092 MODULE_LICENSE("GPL");
2093
2094 static void __init parse_options (char *line)
2095 {
2096         char *next = line;
2097
2098         if (line == NULL || !*line)
2099                 return;
2100         while ((line = next) != NULL) {
2101                 if ((next = strchr(line,' ')) != NULL)
2102                         *next++ = 0;
2103                 if (!ide_setup(line))
2104                         printk (KERN_INFO "Unknown option '%s'\n", line);
2105         }
2106 }
2107
2108 int __init init_module (void)
2109 {
2110         parse_options(options);
2111         return ide_init();
2112 }
2113
2114 void __exit cleanup_module (void)
2115 {
2116         int index;
2117
2118         for (index = 0; index < MAX_HWIFS; ++index)
2119                 ide_unregister(index);
2120
2121 #ifdef CONFIG_BLK_DEV_IDEPNP
2122         pnpide_exit();
2123 #endif
2124
2125 #ifdef CONFIG_PROC_FS
2126         proc_ide_destroy();
2127 #endif
2128
2129         bus_unregister(&ide_bus_type);
2130 }
2131
2132 #else /* !MODULE */
2133
2134 __setup("", ide_setup);
2135
2136 module_init(ide_init);
2137
2138 #endif /* MODULE */